Optical system

ABSTRACT

An optical system includes a base, a first lens driving module, and a second lens driving module. The first lens driving module includes a first lens holder, a first magnet, and a first coil. The first lens holder is configured to hold a first optical element. The first coil corresponding to the first magnet is configured to drive the first lens holder to move relative to the base. The second lens driving module includes a second lens holder, a second magnet, and a second coil. The second lens holder is configured to hold a second optical element. The second coil corresponding to the second magnet is configured to drive the second lens holder to move relative to the base. The first magnet is disposed between the first and second lens holders, and no other magnet is disposed between the first and second lens holders except the first magnet.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/405,450 filed on Oct. 7, 2016, and China Patent Application No.201710494178.X, filed Jun. 26, 2017, the entirety of which isincorporated by references herein.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

The present disclosure relates to an optical system, and moreparticularly to an optical system whose two lenses are driven by anelectromagnetic force.

Description of the Related Art

As technology has progressed, many kinds of electronic devices, such astablet computers and smart phones, have developed the functionality ofdigital photography or video recording. A user can operate theelectronic device to capture various images using the camera module ofthe electronic device, so that electronic devices with a camera modulehave become popular.

Recently, a camera module having two lenses has gradually becomepopular. However, the two lens driving modules that are used for drivingthe two lenses in current dual-lens camera modules are usually close toeach other, so that magnetic interference between the magnets ofdifferent lens driving modules is generated, causing the focus speed andaccuracy of the lens to be affected.

Therefore, how to design an optical system capable of preventingmagnetic interference between different lens driving modules is animportant subject for further research and development.

BRIEF SUMMARY OF THE DISCLOSURE

Accordingly, one objective of the present disclosure is to provide anoptical system that has two optical elements, and the magneticinterference generated by the magnetic elements of the two lens drivingmodules can be reduced, so as to improve the focus speed and accuracy ofthe lens in the optical system.

According to some embodiments of the disclosure, the optical systemincludes a base, a first lens driving module and a second lens drivingmodule. The first lens driving module includes a first lens holder, afirst magnet and a first coil. The first lens holder is configured tohold a first optical element. The first coil corresponds to the firstmagnet, and the first coil is configured to drive the first lens holderto move relative to the base. The second lens driving module includes asecond lens holder, a second magnet and a second coil. The second lensholder is configured to hold a second optical element. The second coilcorresponds to the second magnet, and the second coil is configured todrive the second lens holder to move relative to the base. The firstmagnet is disposed between the first and second lens holders, and noother magnet is disposed between the first and second lens holdersexcept the first magnet.

In some embodiments, the first magnet has a long strip-shaped structureand extends along a first direction, and the second magnet has a longstrip-shaped structure and extends along a second direction, wherein thefirst direction is perpendicular to the second direction.

In some embodiments, the first and second lens holders are arrangedalong the second direction.

In some embodiments, the diameter of the first optical element isgreater than the diameter of the second optical element.

In some embodiments, the optical system further includes two secondmagnets and two second coils, wherein the distance between the twosecond magnets along the first direction or the distance between the twosecond coils along the first direction is less than the width of thefirst lens holder along the first direction.

In some embodiments, a connecting line is defined by connecting thecenters of the first and second optical elements, and the position ofthe first magnet is deviated from the midpoint of the connecting line.

According to another embodiment of the disclosure, an optical systemincludes a base, a first lens driving module and a second lens drivingmodule. The first lens driving module includes a first lens holder, afirst magnet and a first coil. The first lens holder is configured tohold a first optical element. The first coil corresponds to the firstmagnet, and the first coil is configured to drive the first lens holderto move relative to the base. The second lens driving module includes asecond lens holder and a second coil. The second lens holder isconfigured to hold a second optical element. The second coil correspondsto the first magnet, and the second coil is configured to drive thesecond lens holder to move relative to the base. The first magnet isdisposed between the first and second lens holders, and no other magnetis disposed between the first and second lens holders except the firstmagnet.

According to another embodiment of the disclosure, an optical systemincludes a base, a first lens driving module and a second lens drivingmodule. The first lens driving module includes a first lens holder, twofirst magnets and a first coil. The first lens holder is configured tohold a first optical element. The first coil corresponds to the firstmagnets, and the first coil is configured to drive the first lens holderto move relative to the base. The second lens driving module includes asecond lens holder, a second magnet and a second coil. The second lensholder is configured to hold a second optical element. The second coilcorresponds to the second magnet, and the second coil is configured todrive the second lens holder to move relative to the base. The firstmagnets are disposed between the first and second lens holders, and noother magnet is disposed between the first and second lens holdersexcept the first magnets.

In some embodiments, the first magnets are arranged along a firstdirection, the first and second lens holders are arranged along a seconddirection, and the first direction is perpendicular to the seconddirection.

The invention discloses an optical system including the first lensdriving module and the second lens driving module. At least one magnetis disposed on only one position along the X-axis, and the singleposition is between the first lens holder and the second lens holder.Therefore, it can prevent the magnetic interference resulting fromdifferent magnets of the first lens driving module and the second lensdriving module.

In some embodiments, the first magnets, the first coils, the secondmagnet and the second coils are arranged along the second direction, andthere is no magnet or coil disposed on the first lens holder and thesecond lens holder along the first direction. Therefore, the width ofthe base can be reduced, so as to achieve the purpose ofminiaturization.

In some embodiments, the first magnet has the long strip-shapedstructure and extends along the first direction, and the second magnethas the long strip-shaped structure and extends along the seconddirection. Therefore, the length of the base can be reduced because ofthe structural design, so as to achieve the purpose of miniaturization.

In addition, in some embodiments, the first coil surrounds the peripheryof the first lens holder, and it increases the convenience of productionbecause of the structural design.

Additional features and advantages of the disclosure will be set forthin the description which follows, and, in part, will be obvious from thedescription, or can be learned by practice of the principles disclosedherein. The features and advantages of the disclosure can be realizedand obtained by means of the instruments and combinations particularlypointed out in the appended claims. These and other features of thedisclosure will become more fully apparent from the followingdescription and appended claims, or can be learned by the practice ofthe principles set forth herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of an optical system according to an embodiment ofthe disclosure.

FIG. 2 shows an exploded diagram of the optical system in FIG. 1.

FIG. 3 shows a cross-sectional view along the line A-A′ in FIG. 1.

FIG. 4 shows a schematic plane view illustrating the arrangement of thecoils and the magnets of the optical system in FIG. 1 according to theembodiment of the disclosure.

FIG. 5 shows a schematic plane view illustrating the arrangement of thecoils and the magnets of the first lens driving module and the secondlens driving module according to another embodiment of the disclosure.

FIG. 6 shows a schematic plane view illustrating the arrangement of thecoils and the magnets of the first lens driving module and the secondlens driving module according to another embodiment of the disclosure.

FIG. 7 shows a schematic plane view illustrating the arrangement of thecoils and the magnets of the first lens driving module and the secondlens driving module according to another embodiment of the disclosure.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

In the following detailed description, for the purposes of explanation,numerous specific details and embodiments are set forth in order toprovide a thorough understanding of the present disclosure. The specificelements and configurations described in the following detaileddescription are set forth in order to clearly describe the presentdisclosure. It will be apparent, however, that the exemplary embodimentsset forth herein are used merely for the purpose of illustration, andthe inventive concept may be embodied in various forms without beinglimited to those exemplary embodiments. In addition, the drawings ofdifferent embodiments may use like and/or corresponding numerals todenote like and/or corresponding elements in order to clearly describethe present disclosure. However, the use of like and/or correspondingnumerals in the drawings of different embodiments does not suggest anycorrelation between different embodiments. The directional terms, suchas “up”, “down”, “left”, “right”, “front” or “rear”, are referencedirections for accompanying drawings. Therefore, using the directionalterms is for description instead of limiting the disclosure.

In this specification, relative expressions are used. For example,“lower”, “bottom”, “higher” or “top” are used to describe the positionof one element relative to another. It should be appreciated that if adevice is flipped upside down, an element at a “lower” side will becomean element at a “higher” side.

The terms “about” and “substantially” typically mean +/−20% of thestated value, more typically +/−10% of the stated value and even moretypically +/−5% of the stated value. The stated value of the presentdisclosure is an approximate value. When there is no specificdescription, the stated value includes the meaning of “about” or“substantially”.

Please refer to FIG. 1 to FIG. 3. FIG. 1 is a diagram of an opticalsystem 100 according to an embodiment of the disclosure. FIG. 2 shows anexploded diagram of the optical system 100 in FIG. 1. FIG. 3 shows across-sectional view along the line A-A′ in FIG. 1. The optical system100 can be an image capturing system which has two lens driving modules2 (a first lens driving module 100A and a second lens driving module100B) for holding two optical elements (not shown in the figures), andthe optical system 100 may be provided in several electronic devices orportable electronic devices for allowing the user to perform the imagecapturing function. In this embodiment, the two lens driving modules canbe voice coil motors (VCM) having the same specification and equippedwith an optical image stabilizer (OIS) function, but the invention isnot limited thereto. In some embodiments, the two lens driving modulesof the optical system 100 may also have different specifications and beequipped with auto-focus (AF) and OIS functions.

As shown in FIG. 1 to FIG. 3, in this embodiment, the optical system 100mainly includes a top casing 102, a frame 104, an upper spring sheet106, a first lens holder 108, a first magnet M11, a first magnet M12, afirst coil CL11, a first coil CL12, a second lens holder 110, a secondmagnet M21, a second coil CL21, a second coil CL22, a lower spring sheet112 and a base 114. The first lens driving module 100A is composed ofthe first lens holder 108, the first magnet M11, the first magnet M12,the first coil CL11 and the first coil CL12, and the second lens drivingmodule 100B is composed of the second lens holder 110, the second magnetM21, the second coil CL21 and the second coil CL22. The first lensholder 108 and the second lens holder 110 are respectively used forholding a first optical element and a second optical element (not shownin the figures). In addition, the first coil CL11 corresponds to thefirst magnet M11, the first coil CL12 corresponds to the first magnetM12, the second coil CL22 corresponds to the first magnet M12, and thesecond coil CL21 corresponds to the second magnet M21.

The top casing 102 has a hollow structure, and can be combined with thebase 114. A top casing opening 1021 and a top casing opening 1022 areformed on the top casing 102, and a base opening 1141 and a base opening1142 are formed on the base 114. The center of the top casing opening1021 corresponds to an optical axis O1 of the first optical element (notshown in the figures) which is held by the first lens holder 108. Thebase opening 1141 corresponds to a first image sensing element (nowshown in the figures) below the base 114. The center of the top casingopening 1022 corresponds to an optical axis O2 of the second opticalelement (not shown in the figures) which is held by the second lensholder 110. The base opening 1142 corresponds to a second image sensingelement (now shown in the figures) below the base 114. Accordingly, thefirst lens driving module 100A and the second lens driving module 100Bcan respectively drive the first optical element and the second opticalelement to move along the optical axis O1 and optical axis O2 to performimage focusing function.

The frame 104 has a first opening 1041, a second opening 1042 and aplurality of grooves. In this embodiment, the frame 104 has a groove1043, a groove 1044 and a groove 1045, but the amounts of the groovesare not limited thereto. The first magnet M11 can be correspondinglydisposed in the groove 1043, the first magnet M12 can be correspondinglydisposed in the groove 1044, and the second magnet M21 can becorrespondingly disposed in the groove 1045. In some embodiment, thefirst magnet M11, the first magnet M12 and the second magnet M21 havelong strip-shaped structures.

The first lens holder 108 and the second lens holder 110 respectivelyhave hollow ring structures, and the first lens holder 108 and thesecond lens holder 110 respectively have a first through hole 1081 and asecond through hole 1101. The first through hole 1081 forms a threadedstructure (not shown) corresponding to another threaded structure (notshown) on the first optical element, such that the first optical elementcan be locked in the first through hole 1081. The second through hole1101 forms a threaded structure (not shown) corresponding to anotherthreaded structure (not shown) on the second optical element, such thatthe second optical element can be locked in the second through hole1101. The first coil CL11, the first coil CL12 are disposed on the firstlens holder 108, and the second coil CL21 and the second coil CL22 aredisposed on the second lens holder 110.

In this embodiment, the first lens holder 108 and the first opticalelement are disposed in the first opening 1041 and can move relative tothe frame 104. The second lens holder 110 and the second optical elementare disposed in the second opening 1042 and can move relative to theframe 104. More specifically, the upper spring sheet 106 has a firstresilient portion 106A and a second resilient portion 106B, and thelower spring sheet 112 has a third resilient portion 112A and a fourthresilient portion 112B. The first lens holder 108 is connected to theframe 104 by the first resilient portion 106A and the third resilientportion 112A, so that the first lens holder 108 is suspended in thefirst opening 1041. The second lens holder 110 is connected to the frame104 by the second resilient portion 106B and the fourth resilientportion 112B, so that the second lens holder 110 is suspended in thesecond opening 1042. When a current is supplied to the first coil CL11and the first coil CL12, the first coil CL11 and the first coil CL12 canrespectively act with the magnetic fields of the first magnet M11 andthe first magnet M12 to generate an electromagnetic force, so as todrive the first lens holder 108 to move relative to the frame 104 alongthe Z-axis. Similarly, when a current is supplied to the second coilCL21 and the second coil CL22, the second coil CL21 and the second coilCL22 can respectively act with the magnetic fields of the second magnetM21 and the first magnet M12 to generate the electromagnetic force, soas to drive the second lens holder 110 to move relative to the frame 104along the Z-axis. For example, the first magnet M11, the first magnetM12 and the second magnet M21 can include at least one multipole magnetwhich is used to electromagnetically act with the corresponding coil todrive the first lens holder 108 and the second lens holder 110 to movealong the optical axis O1 and the optical axis O2 respectively, so as toperform image focusing.

It should be understood that the first resilient portion 106A and thesecond resilient portion 106B are integrally formed, and the thirdresilient portion 112A and the fourth resilient portion 112B areintegrally formed in this embodiment, but they are not limited thereto.For example, the first resilient portion 106A and the second resilientportion 106B can be two spring sheets separate from each other, and thethird resilient portion 112A and the fourth resilient portion 112B canbe two spring sheets separate from each other.

As shown in FIG. 2, six protruding columns 1143 are formed on the base114, and the protruding columns 1143 are used for combining the frame104 with the base 114. The outer peripheral portion of the upper springsheet 106 is fixed to the protruding columns 1143 and is located betweenthe frame 104 and the base 104 (as shown in FIG. 3). Moreover, the innerperipheral portions of the first resilient portion 106A and the thirdresilient portion 112A are respectively connected to the upper and lowersides of the first lens holder 108, so that the first lens holder 108can be suspended in the first opening 1041 of the frame 104. The innerperipheral portions of the second resilient portion 106B and the fourthresilient portion 112B are respectively connected to the upper and lowersides of the second lens holder 110, so that the second lens holder 110can be suspended in the second opening 1042 of the frame 104.

Please refer to FIG. 3. In the optical system 100, because the firstlens driving module 100A is very close to the second lens driving module100B, if the first magnet and the second magnet are disposed on adjacentsides of the first lens driving module 100A and the second lens drivingmodule 100B at the same time, and then magnetic interference between theadjacent first and second magnets is likely to occur, causing the focusspeed and accuracy of the optical elements to be adversely affected.Therefore, only one first magnet M12 is disposed between the first lensholder 108 and the second lens holder 110 in this embodiment, and thefirst magnet M12 corresponds to the first coil CL12 and the second coilCL21 at the same time, so as to prevent the magnetic interferenceproblem.

FIG. 4 shows a schematic plane view illustrating the arrangement of thecoils and the magnets of the optical system 100 in FIG. 1 according tothe embodiment of the disclosure. For the sake of simplicity andclarity, this embodiment and the following embodiments illustrate onlythe first lens driving module 100A, the second lens driving module 100Band the base 114 to show their relative positions. As shown in FIG. 4,in the optical system 100, a connecting line is defined by connectingthe centers of the first and second optical elements, and a central lineC can be defined by the midpoint of the connecting line. The centralline C is parallel to the Y-axis (a first direction) and is locatedbetween the first lens holder 108 and the second lens holder 110. It isnoted that only the first magnet M12 is disposed between the first lensholder 108 and the second lens holder 110, and no other magnet isdisposed between the first lens holder 108 and the second lens holder110 except the first magnet M12. The first magnet M12 is disposed alongthe central line C.

Furthermore, the first lens holder 108 and the second lens holder 110are arranged along the X-axis (a second direction), and the firstdirection is perpendicular to the second direction. As shown in FIG. 4,the first coil CL12 and the second coil CL22 are located on two oppositesides of the first magnet M12. The first magnet M11 and the secondmagnet M21 are located on two opposite sides of the base 114, and thecorresponding first coil CL11 and the corresponding second coil CL21 arealso located on the two opposite sides of the base 114. That is, themagnets and the coils of the first lens driving module 100A (the firstmagnets M11, M12 and the first coils CL11, CL12) and the magnet and thecoils of the second lens driving module 100B (the second coils CL22,CL21 and the second magnet M21) are only arranged along the X-axis (thesecond direction).

Based on the above structural design shown in FIG. 4, the magneticinterference resulting from the first lens driving module 100A and thesecond lens driving module 100B can be prevented, so as to ensure thefocus speed and positioning accuracy of the optical elements. Inaddition, the magnets and the coils of the first lens driving module100A and the second lens driving module 100B are only arranged along theX-axis, which means that there is no magnet or coil disposed on thelongitudinal side of the base 114, so that the width of the base 114along the Y-axis can be reduced, so as to achieve the purpose ofminiaturization of the optical system 100.

In addition, it should be noted that another embodiment can only includethe first coil CL12, the first magnet M12, and the second coil CL22.When the first coil CL12 is supplied with electricity, the first coilCL12 electromagnetically acts with the first magnet M12 to generate theelectromagnetic force to drive the first lens holder 108 to moverelative to the base 114 along the Z-axis, so as to perform theauto-focus function. When the second coil CL22 is supplied withelectricity, the second coil CL22 also electromagnetically acts with thefirst magnet M12 to generate the electromagnetic force to drive thesecond lens holder 110 to move relative to the base 114 along theZ-axis, so as to perform the auto-focus function of the dual opticalelements.

FIG. 5 shows a schematic plane view illustrating the arrangement of thecoils and the magnets of the first lens driving module 100A and thesecond lens driving module 100B according to another embodiment of thedisclosure. In FIG. 5, the lens driving modules on the left side and theright side are respectively the first lens driving module 100A and thesecond lens driving module 100B. As shown in FIG. 5, the first lensholder 108 and the second lens holder 110 are arranged along the X-axis(the second direction). In addition, in this embodiment, only two firstmagnets M13 shown in FIG. 5 are disposed between the first lens holder108 and the second lens holder 110, and no other magnet is disposedbetween the first lens holder 108 and the second lens holder 110 exceptthe first magnets M13. The first magnets M13 are spaced apart from eachother and are disposed along the Y-axis (the first direction). In thisembodiment, the first magnets M13 are arranged along the central line C,and the length of each of the first magnets M13 is shorter than thelength of the first magnet M12 or the second magnet M21.

Based on the above structural design shown in FIG. 5, because only thetwo first magnets M13 arranged along the Y-axis are disposed between thefirst lens holder 108 and the second lens holder 110, the magneticinterference problem can be prevented. The first coil CL12 and thesecond coil CL22 respectively electromagnetically act with the firstmagnets M13 to generate the electromagnetic force, so as to respectivelydrive the first lens holder 108 and the second lens holder 110 to movealong the Z-axis. It is noted that another one protruding column 1143can be formed on the base 114, and the protruding column 1143 is locatedbetween the first lens holder 108 and the second lens holder 110 and islocated between the first magnets M13, so as to facilitate positioningthe first magnets M13. For example, the first magnets M13 can be stablyfixed to the protruding column 1143 by glue or in a manner ofengagement. As a result, when the optical system 100 is physicallyapplied by an external shock, this design of the optical system 100 canwithstand the external shock and can prevent the first magnets M13 fromseparating from their original positions.

Please refer to FIG. 6, which shows a schematic plane view illustratingthe arrangement of the coils and the magnets of the first lens drivingmodule 100A and the second lens driving module 100B according to anotherembodiment of the disclosure. In FIG. 6, the lens driving modules on theleft side and the right side are respectively the first lens drivingmodule 100A and the second lens driving module 100B. As shown in FIG. 6,the first lens driving module 100A includes the first lens holder 108,the first magnet M11, the first coil CL11, the first coil CL12, and thefirst magnet M12. The second lens driving module 100B includes thesecond lens holder 110, the second magnet M21, the second coil CL21, asecond magnet M22, and the second coil CL22. The first magnet M11 andthe first magnet M12 have long strip-shaped structures, and the firstmagnet M11 and the first magnet M12 extend along the Y-axis (the firstdirection). The second magnet M21 and the second magnet M22 have longstrip-shaped structures, and the second magnet M21 and the second magnetM22 extend along the X-axis (the second direction).

It should be noted that the first lens holder 108 and the second lensholder 110 are arranged along the X-axis (the second direction), andonly the first magnet M12 is disposed between the first lens holder 108and the second lens holder 110. No other magnet is disposed between thefirst lens holder 108 and the second lens holder 110 except the firstmagnet M12. The position of the first magnet M12 is deviated from thecentral line C. For example, in this embodiment, the connecting linedefined by the centers of the first and second optical elements, and thecentral line C is defined by the midpoint of the connecting line. Theposition of the first magnet M12 is deviated from the central line C andis located on the right side of the central line C. In addition, thefirst magnet M11 and the first magnet M12 are located on opposite sidesof the first lens holder 108, and the first coil CL11 and the first coilCL12 are also located on the opposite sides of the first lens holder108. When the first coil CL12 and the first coil CL12 are supplied withelectricity, the first coil CL11 and the first coil CL12 canrespectively electromagnetically act with the corresponding first magnetM11 and the corresponding first magnet M12 to generate theelectromagnetic force, so as to drive the first lens holder 108 and thefirst optical element to move relative to the base 114.

Furthermore, as shown in FIG. 6, the second magnet M21 and the secondmagnet M22 are located on opposite sides of the second lens holder 110,and the second coil CL21 and the second coil CL22 are also located onthe opposite sides of the second lens holder 110. It should be notedthat the diameter D2 of the second through hole 1101 of the second lensholder 110 is less than the diameter D1 of the first through hole 1081of the first lens holder 108. That is, the diameter of the first opticalelement is greater than the diameter of the second optical element.Besides, the distance dl between the second coil CL21 and the secondcoil CL22 along the Y-axis (the second direction) is less than the widthW of the first lens holder 108 along the Y-axis (the second direction).In addition, the distance between the second magnet M21 and the secondmagnet M22 along the Y-axis can be also less than the width W along theY-axis. For example, the second coil CL21 and the second coil CL22overlap the first lens holder 108 when viewed along the X-axis (thefirst direction), and the second magnet M21 and the second magnet M22partially overlap the first lens holder 108 when viewed along the X-axis(the first direction). When the second coil CL21 and the second coilCL22 are supplied with electricity, the second coil CL21 and the secondcoil CL22 can respectively electromagnetically act with thecorresponding second magnet M21 and the corresponding second magnet M22to generate the electromagnetic force, so as to drive the second lensholder 110 and the second optical element to move relative to the base114.

It should be noted that the magnets and the coils of the first lensdriving module 100A (the first magnets M11, M12 and the first coilsCL11, CL12) are only arranged along the X-axis, and the magnets and thecoils of the second lens driving module 100B (the second magnets M21,M22 and the second coils CL21, CL22) are only arranged along the Y-axis.As a result, the connecting line defined by connecting the centers ofthe first magnet M11 and the first magnet M12 is not parallel to theconnecting line defined by connecting the centers of the second magnetM21 and the second magnet M22. In this embodiment, the connecting lineof the first magnet M11 and the first magnet M12 extends across theconnecting line of the second magnet M21 and the second magnet M22, andthe connecting line of the first magnet M11 and the first magnet M12 isperpendicular to the connecting line of the second magnet M21 and thesecond magnet M22.

Because the magnets and the coils of the first lens driving module 100Aare only arranged along the X-axis, and the magnets and the coils of thesecond lens driving module 100B are only arranged along the Y-axis, theproblem of magnetic interference resulting from the first lens drivingmodule 100A and the second lens driving module 100B can be prevented,and the length of the base 114 along the X-axis and the width of thebase 114 along the Y-axis can be reduced, so as to achieve the purposeof miniaturization of the optical system 100.

Please refer to FIG. 7, which shows a schematic plane view illustratingthe arrangement of the coils and the magnets of the first lens drivingmodule 100A and the second lens driving module 100B according to anotherembodiment of the disclosure. In FIG. 7, the lens driving modules on theleft side and the right side are respectively the first lens drivingmodule 100A and the second lens driving module 100B. The differencebetween this embodiment and the embodiment in FIG. 6 is that the firstlens driving module 100A includes a first coil CL13, which surrounds theperiphery of the first lens holder 108 and corresponds the first magnetM11 and the first magnet M12. It increases the convenience of productiondue to the design of the first coil CL13 surrounding the periphery ofthe first lens holder 108

Similarly, the magnets and the coil of the first lens driving module100A (the first magnets M11, M12 and the first coil CL13) are onlyarranged along the X-axis, and the magnets and the coils of the secondlens driving module 100B (the second magnets M21, M22 and the secondcoils CL21, CL22) are only arranged along the Y-axis. As a result, theconnecting line defined by the centers of the first magnet M11 and thefirst magnet M12 is not parallel to the connecting line defined by thecenters of the second magnet M21 and the second magnet M22. In thisembodiment, the connecting line of the first magnet M11 and the firstmagnet M12 extends across the connecting line of the second magnet M21and the second magnet M22, and the connecting line of the first magnetM11 and the first magnet M12 is perpendicular to the connecting line ofthe second magnet M21 and the second magnet M22.

Because the second magnet M21 and the second magnet M22 are not close tothe first magnet M12, the magnetic interference problem between thosemagnets can be also prevented, and the length of the base 114 along theX-axis can be reduced due to the structural design of this embodiment,so as to achieve the purpose of mechanical miniaturization.

In conclusion, the invention provides the optical system 100 includingthe first lens driving module 100A and the second lens driving module100B. At least one magnet is disposed on only one position along theX-axis, and the single position is between the first lens holder 108 andthe second lens holder 110. Therefore, it can prevent the magneticinterference resulting from different magnets of the first lens drivingmodule 100A and the second lens driving module 100B.

In some embodiments, the first magnets, the first coils, the secondmagnet and the second coils are arranged along the X-axis, and there isno magnet or coil disposed on the first lens holder 108 and the secondlens holder 110 along the Y-axis. Therefore, the width of the base 114can be reduced, so as to achieve the purpose of miniaturization.

In some embodiments, the first magnet has the long strip-shapedstructure and extends along the Y-axis (the first direction), and thesecond magnet has the long strip-shaped structure and extends along theX-axis (the second direction). Therefore, the length of the base 114 canbe reduced because of this structural design, so as to achieve thepurpose of miniaturization.

In addition, in some embodiments, the first coil surrounds the peripheryof the first lens holder 108, and it increases the convenience ofproduction because of the structural design.

Although the embodiments and their advantages have been described indetail, it should be understood that various changes, substitutions, andalterations can be made herein without departing from the spirit andscope of the embodiments as defined by the appended claims. Moreover,the scope of the present application is not intended to be limited tothe particular embodiments of the process, machine, manufacture,composition of matter, means, methods, and steps described in thespecification. As one of ordinary skill in the art will readilyappreciate from the disclosure, processes, machines, manufacture,compositions of matter, means, methods, or steps, presently existing orlater to be developed, that perform substantially the same function orachieve substantially the same result as the corresponding embodimentsdescribed herein may be utilized according to the disclosure.Accordingly, the appended claims are intended to include within theirscope such processes, machines, manufacture, compositions of matter,means, methods, or steps. In addition, each claim constitutes a separateembodiment, and the combination of various claims and embodiments arewithin the scope of the disclosure.

What is claimed is:
 1. An optical system, comprising: a base; a firstlens driving module, comprising: a first lens holder, configured to holda first optical element; a first magnet; and a first coil correspondingto the first magnet, configured to drive the first lens holder to moverelative to the base; and a second lens driving module, comprising: asecond lens holder, configured to hold a second optical element; asecond magnet; and a second coil corresponding to the second magnet,configured to drive the second lens holder to move relative to the base;wherein the first magnet is disposed between the first and second lensholders, and no other magnet is disposed between the first and secondlens holders except the first magnet.
 2. The optical system as claimedin claim 1, wherein the first magnet has a long strip-shaped structureand extends along a first direction, and the second magnet has a longstrip-shaped structure and extends along a second direction, wherein thefirst direction is perpendicular to the second direction.
 3. The opticalsystem as claimed in claim 2, wherein the first and second lens holdersare arranged along the second direction.
 4. The optical system asclaimed in claim 1, wherein the diameter of the first optical element isgreater than the diameter of the second optical element.
 5. The opticalsystem as claimed in claim 4, wherein the first magnet has a longstrip-shaped structure and extends along a first direction, and thesecond magnet has a long strip-shaped structure and extends along asecond direction, wherein the first direction is perpendicular to thesecond direction.
 6. The optical system as claimed in claim 5, whereinthe first and second lens holders are arranged along the seconddirection.
 7. The optical system as claimed in claim 4, wherein theoptical system further comprises two second magnets and two secondcoils, wherein the distance between the two second magnets along thefirst direction or the distance between the two second coils along thefirst direction is less than the width of the first lens holder alongthe first direction.
 8. The optical system as claimed in claim 1,wherein a connecting line is defined by connecting the centers of thefirst and second optical elements, and the position of the first magnetis deviated from the midpoint of the connecting line.
 9. The opticalsystem as claimed in claim 1, wherein the optical system furthercomprises an upper spring sheet and a lower spring sheet, and the firstlens holder and the second lens holder are disposed between the upperspring sheet and the lower spring sheet.
 10. The optical system asclaimed in claim 9, wherein the upper spring sheet or the lower springsheet is integrally formed in one piece.
 11. An optical system,comprising: a base; a first lens driving module, comprising: a firstlens holder, configured to hold a first optical element; a first magnet;and a first coil corresponding to the first magnet, configured to drivethe first lens holder to move relative to the base; and a second lensdriving module, comprising: a second lens holder, configured to hold asecond optical element; and a second coil corresponding to the firstmagnet, configured to drive the second lens holder to move relative tothe base; wherein the first magnet is disposed between the first andsecond lens holders, and no other magnet is disposed between the firstand second lens holders except the first magnet.
 12. The optical systemas claimed in claim 11, wherein the first magnet has a long strip-shapedstructure and extends along a first direction.
 13. The optical system asclaimed in claim 12, wherein the first and second lens holders arearranged along a second direction, and the first direction isperpendicular to the second direction.
 14. The optical system as claimedin claim 11, wherein the optical system further comprises an upperspring sheet and a lower spring sheet, and the first lens holder and thesecond lens holder are disposed between the upper spring sheet and thelower spring sheet.
 15. The optical system as claimed in claim 14,wherein the upper spring sheet or the lower spring sheet is integrallyformed in one piece.
 16. An optical system, comprising: a base; a firstlens driving module, comprising: a first lens holder, configured to holda first optical element; two first magnets; and a first coilcorresponding to the first magnets, configured to drive the first lensholder to move relative to the base; and a second lens driving module,comprising: a second lens holder, configured to hold a second opticalelement; a second magnet; and a second coil corresponding to the secondmagnet, configured to drive the second lens holder to move relative tothe base; wherein the first magnets are disposed between the first andsecond lens holders, and no other magnet is disposed between the firstand second lens holders except the first magnets.
 17. The optical systemas claimed in claim 16, wherein the first magnets are arranged along afirst direction, the first and second lens holders are arranged along asecond direction, and the first direction is perpendicular to the seconddirection.
 18. The optical system as claimed in claim 16, wherein thelength of the first magnet is shorter than the length of the secondmagnet.
 19. The optical system as claimed in claim 16, wherein aprotruding column is formed on the base, and the protruding column islocated between the two first magnets.
 20. The optical system as claimedin claim 16, wherein a connecting line is defined by connecting thecenters of the first and second optical elements, a central line isdefined by the midpoint of the connecting line, and the first magnetsare arranged along the central line.